package comp.wxapi.utils;

import java.net.InetAddress;

import javax.servlet.http.HttpServletRequest;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class IPUtils {

	private static final Logger LOGGER = LoggerFactory.getLogger(IPUtils.class);

	/**
	 * 获取本机IP地址
	 * 
	 * @return
	 */
	public static String getHostAddress() {
		InetAddress address = null;
		String hostAddress = "";
		try {
			address = InetAddress.getLocalHost();
			hostAddress = address.getHostAddress();
		} catch (Exception e) {
			e.printStackTrace();
		}
		return hostAddress;
	}
	
	/**
	 * 客户端真是IP地址获取
	 * @param request
	 * @return
	 */
	public static String getIpAddress(HttpServletRequest request) {
		String ip = request.getHeader("x-forwarded-for");
		LOGGER.info("x-forwarded-for======={}", ip);
		if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
			ip = request.getHeader("Proxy-Client-IP");
			LOGGER.info("Proxy-Client-IP======={}", ip);
		}
		if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
			ip = request.getHeader("WL-Proxy-Client-IP");
			LOGGER.info("WL-Proxy-Client-IP======={}", ip);
		}
		if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
			ip = request.getRemoteAddr();
			if (ip.equals("127.0.0.1") || ip.equals("0:0:0:0:0:0:0:1")) {
				// 根据网卡取本机配置的IP
				ip = getHostAddress();
			}
			LOGGER.info("RemoteAddr======={}", ip);
		}
		// 对于通过多个代理的情况，第一个IP为客户端真实IP,多个IP按照','分割
		if (ip != null && ip.length() > 15) { // "***.***.***.***".length() = 15
			if (ip.indexOf(",") > 0) {
				ip = ip.substring(0, ip.indexOf(","));
			}
		}
		return ip;
	}
}
